Ministry of Culture. The Publicity Division, 1977
Buku Teks
Reference Service Division. National Library Singapore, 1984
Buku Referensi
Saw Swee Hock
ISEAS (Institute of Southeast Asian Studies), 2007
Buku Teks
edited by Helen Hughes and You Poh Seng
University of Wisconsin Press, 1969
Buku Teks
Turnbull, C. M. (Constance Mary), author
Oxford University Press, 1985
Buku Teks